Liquid dispensing system



Nov. 15, L193.2. H. GQWEYMOU'TH 1,887,609

LIQUID DSPENSING SYSTEM Filed Nov. l, 1929 2 Sheets-Sheet Nov. 15, 1932. H G. WEYMOUTH 1,887,609

LIQUID DISPENSING SYSTEM Filed Nov. l, 1929 2 Sheets-Sheet 2 gnvefnfoz tank for increasing the'pressure therein for Patented Nov. 1,5, .1932-,

HARRY G. WEYMOUTHY, 0F PITTSURGH, PENNSYLVANIA, ASSIGNORTO PITTSBURGH EQUITAIBLE'METER COMPANY, 0F PITTSBURGH, PENNSYLVANIA, A CORI'OIBA'IION- OF PENNSYLVANIA LIQUID nisrnNsiNe SYSTEM l Application led November 1, 1929.- Serial No. 404,040.

The present invention relates to a liquidI dispensing system.

More specifically, the invention relates to a system for dispensing gasoline or other liquid` in arrangements embodying a closed delivering tank for causing the flow of gaso-` line under the action of pneumatic or similar fluid pressure. 1

Systems ofhis general character are now in use but are not entirely satisfactory due to the fact that air is mixed in the gasoline when it is dispensed, thus resulting` in the delivery of a quantity. of gasoline less than the amount indicated by the meter varying in proportion to the amount of air carried with the gasoline. i

It is a primary, object of the present iiivention to provide a gasoline or similar liquid dispensing system comprising a pressure def livery tank provided with an outlet` delivery vpipe in communication with a meter, that has mechanism associated with the tank for automatically vmaintaining a constant viuid pressure as well as .a constant volume of fluid in said tank.v i

It is a-'further 'object of the invention to provide a gasoline dispensing system comprising a storage tank,'a delivery tank in communication lwith said storage tank, iiuid pressure increasing means in said delivery. tank, a delivery pipe provided with a meter in communication' with said delivery tank, and means associated with said delivery tank for automatically operating said pressureincreasing means for maintaining a constant delivery pressure in said delivery tank without increasing the volume of fluid in the delivery tank. c

`.A still furtherl object of the invention is to provide a gasoline dispensing system comprising a storage tank open toatmosphere,

a closed delivery tankin communication with with a meter incommunication 'with said delivery ytank, means for forcing gasoline from said storage tank into said ydelivery f delivering gasoline therefrom under pressure, and means associated withsaid delivery tank for automatically regulating the operation of said means so as tomaintaina constant fluid. pressure and iluid volume in said delivery tank without discharging the fluid through the meter.

A still further objectaof the invention is gasoline into 'said tank forincreasing the fluid 'pressure therein for forcing gasoline from said tank, and including means associated with said tank for automatically vent` comprising a storage tank, a delivery tank in communication with said storage tanka pump for forcing gasoline from said storage 55 lto provide a gasolineldispensing systemcomyprising a delivery tank, means for drawing oov tank vinto said delivery tank for increasing air or fluid pressure therein for forcing gasoline from said delivery tank under air or fluid pressure, a motor for operating said pump, a float operatedair ventr associated with said -delivery tank, a pressure regulator operatively connected with said motor and in communication vwith said pressure tank, sov

thatexcess air. carried by gasoline fromsaid storage tank isvented from said delivery tank and so that said pump is set into operation by said regulator when the pressure drops in said delivery tank; whereby gasoline is forced from said delivery tank under a substantially constant air pressure therein without entrained air and whereby accumulations of air beyond a, predetermined'volum'e'are automatically removed from the sys- A 'tem by said vent.

With these bjects in view as well as others.

that will become apparent during the course of the following disclosure reference willvbe had to the` accompanying drawings formingpart of saine and wherein: v -saidstorage tank, an outlet pipe provided system constructed in accordance with a preferred embodiment of my invention.

Fig. 2 is a view similar to Fig. 1 disclosing a modified embodiment of they invention.

Referring, to the drawings by reference characters, inY which like characters desig ioo nate like parts, and referring first to Fig. 1, 11 designates a asoline storage tank, w 'ich may be of an esired construction and capacit and which is preferably disposed below t e ground indicated at G. The tank 11 is provided with a suitable filling pipe 12 projecting to the surface or above the ground, as indicated, whereby gasoline may be admitted to tank 11 for dispensing by the system hereinafter disclosed. Also disposed beneath the ground in adjacency to tank 11 is a delivery tank 13, which is in communication with tank 11 through a suction pi e 14. Said pipe is provided with a check vaiJve 15 disposed in tank 11. Said pipe is in communication with a centrifugal pump 16 in ltank 13 for drawing gasoline from tank 11 through suction pipe 14 into tank 13 to cause air pressure above the gasoline in tank 13 to build up sufficiently for forcing same there'- from through the delivery connections hereinafter referred to.

v The pump'16 has associated therewith a drive shaft 17 operatively connected above the ground G to a motor 18, which motor is in connection with an electric source by the conductors indicated at 19. A suitable switch, operable through a pressure regulator 21, which is in communication with tank 13 through a pipe 22, serves to control the operation of the motor, by opening the switch when the' pressure in tank 13.reaches a predetermined value and by closing said switch to cause operation of the motor when the pressure falls below said value.

Communicating with tank 13 is one end of an air vent pi e 23, in which is disposed a valve 24 operable by a float 25 disposed within tank l13 and subject to movement in laccordance with-variation of the level of the gasoline therein.

Communicating with tank 13 adjacent the bottom thereof is an outlet or delivery pipe 26 which is inl communication with a meter 27, provided with a connection 28 for the reception of the adjacent end ofv a delivery nozzle. f

In operation of the construction just described, the pump 16 operated by motor 18 draws gasoline through suction pipe 14 into the delivery tank 13 causing the air pressure within tank 13 above the gasoline therein to build up thusforcing gasoline from tank 13 through pipe 26 and meter 27 to al point of delivery upon openingthe usual nozzle controlling valve. Any air or gas carried in suspension by the gasoline pumped from the tank 11 is freed within tank 13 causing`an increased air volume therein. As the air volume increases the level in tank 13 drops, resulting in lowering of float 25 and 'opening of valve 24, thus automatically venting the air to atmosphere through vent pipe 23. When the air is vented in the manner disclosed the pressure within tank 13 drops,

affecting the pressure regulator 21, which is in communication with said tank. Said regulatcr closes the switch in circuit 19 and thus starts the motor 18. Cons uently pum 16 is set in action raising the evel in ta 13 causing float 25 to be raised lto close the air vent control valve 24. The air pressure in the tank 13 then builds up and causes the reglulator to stop motor 18.

hus it will be seen that with the constructiondisclosed a substantially constant operating air volume and pressure is automatically maintained within tank 13 with a substantially constantA level of gasoline therein irrespective of the amount of air or gas carried 1n suspension by the gasoline accumulatino within tank 13, thus positively avoiding the passage of any air with the Gasoline from tank 13 through meter 27. -ii other words, gasoline entirely free from admixture with air is delivered throu meter 27 under a substantially constant air pressure within tank 13, thus insuring the delivery of gasoline in the quantities indicated by meter 27.

In Fig. 2 is disclosed a construction similar to that disclosed in Fig. 1, but modified in the following particulars. In accordance with this form of the invention the pump 16 instead of being located within tank 13 as in the first form of the invention is disposed :13

between tanks 11 and 13 and the suction pipe 14 has disposed therein a check valve 15, which is arranged between tank 13 and the pump 16 where both pump and check valve are readily accessible. Otherwise the construction is substantially the same and functions in the same manner as the construction disclosed in Fig. 1. However, it will be noted that, in this form of the invention, the valve 24 is arranged within a dome 29 lon casing l 13 and is actuated by a float'which may be'A of any desired construction, but, as illustrated, is a ball float y25 as distinguished from the substantially flattened form of float illustrated in Fig. 1. I

The invention, as embodied in both forms disclosed provides a gasoline dispensing system entirely automatic in operation, and in which the gasoline is delivered under a substantially constant air pressure without posl sibility of the passage of air through the registering meter, thus providing a system which, though comparatively simple in construction and automatic in operation, entirely overcomes the objection to systems of 1 this general character now 'in use, in that it positively precludes the passage of air with the gasoline through the meter.

The invention may be embodied in other specific'forms without departing from the l spirit or essential characteristics thereof. v, The present embodiment is therefore to be considered in all respects as illustrative and zio not restrictive, the scope of theinvention bethan by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are ltherefore intended to be embraced therein.

What I claim as my invention is:

1. A liquid dispensing system comprising a closed delivery and fluid separating tank containing liquid and gaseous fluid under pressure, a liquid dispensing pipe connected to saidl tank beneath the liquid level and supplied With liquid under pressure in said tan a meter connected to said dispensing pipe, a pump Within said tank to pump liquid and gaseous fluid into said tank to maintain a sufficient pressure to cause flow through said dispensing pipe, and automatically operating mechanism to discharge excess gaseous fluid from said tank independently of said dispensing pipe.

2. The invention as deiined in claim l wherein said automatically operating mechanism includes a gaseous Huid vent for said tank, a valve to control flow of gaseous fluid through said vent, and a ioat in said tank and connected to said valve to open said valve when the volume of gaseous fluid exceeds a predetermined value.

3. The invention as defined in claim 1 including means to cause operation of said pump to cause flow of liquid and gaseous fluid into said tank when the pressure in the tank drops upon opening of the valve controlling iow through said vent.

4. A liquid dispensing system comprising a delivery and separating tank, pumping means in said tank to setup a flow of liquid into said tank causing a building up of gaseous fluid pressure in said tank, a delivery line separate from said pumping means and opening into said tank beneath the liquid level therein to withdraw liquid under pressure of gaseous fluid in thetank, and mechanism actuated upon variations in gaseous fluid pressure in the tank below a predetermined value to automaticallyjactuate said pumping means and to arrest said pumping means when pressure is restored to said valve.

In testimony whereof I ailix my signature.V

HARRY G. WEYMOUTH. 

